I'm a developer testing a web application on my local Mac. I fired up the web server (google app engine) on port 8888. I can access web app fine at localhost:8888 but was unable to connect from another Mac and iPhone on the same wireless router. The mac firewall (ipfw) is turned off. If go to Preferences and turn on Web Sharing I can access port 80 just fine from these other devices. I'm baffled what is blocking the traffic. Is there another place in Lion where I need to open ports?